<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>string</title>
		<script>
			var s="nihao";
			document.write(s);
			var s2='zhangjiahui';
			alert(s);
			alert(s2);
			//s=s.toUpperCase();
			s=s.big();	
			document.write(s);
			alert(s);
		</script>
	</head>
	<body>
	</body>
</html>